Disable flaky flicker tests

Some tests are still flaky and affecting presubmit

Bug: 185400889
Bug: 186119282
Bug: 186115871
Test: atest FlickerTests WMShellFlickerTests
Change-Id: Ie4e21d01d5ea7586f88470543321ce26ed74afa6

libs/WindowManager/Shell/tests/flicker/src/com/android/wm/shell/flicker/pip/EnterPipTest.kt

@@ -47,6 +47,12 @@ class EnterPipTest(testSpec: FlickerTestParameter) : PipTransition(testSpec) {
             }
         }
 
+    @FlakyTest
+    @Test
+    override fun noUncoveredRegions() {
+        super.noUncoveredRegions()
+    }
+
     @Presubmit
     @Test
     fun pipAppWindowAlwaysVisible() {

tests/FlickerTests/src/com/android/server/wm/flicker/ime/CloseImeWindowToAppTest.kt

@@ -50,6 +50,7 @@ import org.junit.runners.Parameterized
 @RunWith(Parameterized::class)
 @Parameterized.UseParametersRunnerFactory(FlickerParametersRunnerFactory::class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
+@FlakyTest(bugId = 185400889)
 class CloseImeWindowToAppTest(private val testSpec: FlickerTestParameter) {
     private val instrumentation: Instrumentation = InstrumentationRegistry.getInstrumentation()
     private val testApp = ImeAppHelper(instrumentation)

tests/FlickerTests/src/com/android/server/wm/flicker/launch/OpenAppColdTest.kt

@@ -39,6 +39,7 @@ import org.junit.runners.Parameterized
 @RunWith(Parameterized::class)
 @Parameterized.UseParametersRunnerFactory(FlickerParametersRunnerFactory::class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
+@FlakyTest(bugId = 185400889)
 class OpenAppColdTest(testSpec: FlickerTestParameter) : OpenAppTransition(testSpec) {
     override val transition: FlickerBuilder.(Map<String, Any?>) -> Unit
         get() = {